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PM: runtime: Drop pm_runtime_clean_up_links() 

commit d6e3666859 upstream.

After commit d12544fb2a ("PM: runtime: Remove link state checks in
rpm_get/put_supplier()") nothing prevents the consumer device's
runtime PM from acquiring additional references to the supplier
device after pm_runtime_clean_up_links() has run (or even while it
is running), so calling this function from __device_release_driver()
may be pointless (or even harmful).

Moreover, it ignores stateless device links, so the runtime PM
handling of managed and stateless device links is inconsistent
because of it, so better get rid of it entirely.

Fixes: d12544fb2a ("PM: runtime: Remove link state checks in rpm_get/put_supplier()")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 5.1+ <stable@vger.kernel.org> # 5.1+
Tested-by: Xiang Chen <chenxiang66@hisilicon.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafael J. Wysocki 2020-10-21 21:13:10 +02:00 committed by Greg Kroah-Hartman
parent 874dfb5c6a
commit 37f75c6aa8
3 changed files with 0 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/base/dd.c
View File

@ -1121,7 +1121,6 @@ static void __device_release_driver(struct device *dev, struct device *parent)
} }
pm_runtime_get_sync(dev); pm_runtime_get_sync(dev);
pm_runtime_clean_up_links(dev);
driver_sysfs_remove(dev); driver_sysfs_remove(dev);

36
drivers/base/power/runtime.c
View File

@ -1615,42 +1615,6 @@ void pm_runtime_remove(struct device *dev)
pm_runtime_reinit(dev); pm_runtime_reinit(dev);
} }
/**
* pm_runtime_clean_up_links - Prepare links to consumers for driver removal.
* @dev: Device whose driver is going to be removed.
*
* Check links from this device to any consumers and if any of them have active
* runtime PM references to the device, drop the usage counter of the device
* (as many times as needed).
*
* Links with the DL_FLAG_MANAGED flag unset are ignored.
*
* Since the device is guaranteed to be runtime-active at the point this is
* called, nothing else needs to be done here.
*
* Moreover, this is called after device_links_busy() has returned 'false', so
* the status of each link is guaranteed to be DL_STATE_SUPPLIER_UNBIND and
* therefore rpm_active can't be manipulated concurrently.
*/
void pm_runtime_clean_up_links(struct device *dev)
{
struct device_link *link;
int idx;
idx = device_links_read_lock();
list_for_each_entry_rcu(link, &dev->links.consumers, s_node,
device_links_read_lock_held()) {
if (!(link->flags & DL_FLAG_MANAGED))
continue;
while (refcount_dec_not_one(&link->rpm_active))
pm_runtime_put_noidle(dev);
}
device_links_read_unlock(idx);
}
/** /**
* pm_runtime_get_suppliers - Resume and reference-count supplier devices. * pm_runtime_get_suppliers - Resume and reference-count supplier devices.
* @dev: Consumer device. * @dev: Consumer device.

2
include/linux/pm_runtime.h
View File

@ -54,7 +54,6 @@ extern u64 pm_runtime_autosuspend_expiration(struct device *dev);
extern void pm_runtime_update_max_time_suspended(struct device *dev, extern void pm_runtime_update_max_time_suspended(struct device *dev,
s64 delta_ns); s64 delta_ns);
extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable); extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
extern void pm_runtime_clean_up_links(struct device *dev);
extern void pm_runtime_get_suppliers(struct device *dev); extern void pm_runtime_get_suppliers(struct device *dev);
extern void pm_runtime_put_suppliers(struct device *dev); extern void pm_runtime_put_suppliers(struct device *dev);
extern void pm_runtime_new_link(struct device *dev); extern void pm_runtime_new_link(struct device *dev);
@ -173,7 +172,6 @@ static inline u64 pm_runtime_autosuspend_expiration(
struct device *dev) { return 0; } struct device *dev) { return 0; }
static inline void pm_runtime_set_memalloc_noio(struct device *dev, static inline void pm_runtime_set_memalloc_noio(struct device *dev,
bool enable){} bool enable){}
static inline void pm_runtime_clean_up_links(struct device *dev) {}
static inline void pm_runtime_get_suppliers(struct device *dev) {} static inline void pm_runtime_get_suppliers(struct device *dev) {}
static inline void pm_runtime_put_suppliers(struct device *dev) {} static inline void pm_runtime_put_suppliers(struct device *dev) {}
static inline void pm_runtime_new_link(struct device *dev) {} static inline void pm_runtime_new_link(struct device *dev) {}